1. Programme on Mycotoxins and Experimental Carcinogenesis, Medical Research Council, PO Box 19070, Tygerberg 7505, South Africa
2. Istituto Tossine e Micotossine da Parassiti Vegetali, CNR, Viale L Einaudi 51, 70125 Bari, Italy
3. Grain Crops Institute, Agricultural Research Council, Private Bag X1251, Potchefstroom 2520, South Africa
4. Fusarium Research Center, Pennsylvania State University, University Park, PA 16802